JP2009252101A - Apparatus and program for controlling traffic signal in road construction section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for accurately detecting a traffic congestion condition due to construction work on a road. <P>SOLUTION: A traffic signal control apparatus 4 acquires positional information and travel condition information of vehicles 5a to c, 6a to c, and 7a to c from the vehicles around the construction section 1 of a road by means of wireless communication, and specifies the traffic congestion condition at the positions shown by the positional information on the basis of the travel condition information. The traffic signal control apparatus then controls display contents of traffic signals 2 and 3 so that the traffic congestion condition around the construction section 1 can be eased on the basis of the specification result. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a traffic signal control device and a program for the traffic signal control device in a construction section.

Conventionally, unmanned systems have been proposed for grasping the situation of traffic congestion caused by road construction. For example, Patent Document 1 describes a technology for specifying a traffic jam time based on the time required for a specific vehicle to pass between two points around the construction section and the number of vehicles passing the specific point.
JP 2002-49985 A

  However, the technology as described above is poor in accuracy because it only estimates the traffic situation using vehicle information at a limited point.

  In view of the above points, an object of the present invention is to provide a technique for more accurately grasping a traffic jam caused by road construction.

  In order to achieve the above object, an invention according to claim 1 relates to a traffic signal control device for controlling traffic signals (2, 3) provided on both sides of a construction section. This traffic light control device acquires the position information and traveling state information of the vehicle from the vehicles around the construction section by wireless communication, and based on the traveling state information, the traffic congestion state at the position indicated by the position information And the display contents of the traffic lights (2 and 3) are controlled based on the identification result so that the traffic congestion around the construction section is alleviated.

  Thus, the traffic signal control apparatus can acquire information on the traveling state at the position by receiving both the position information and the traveling state information of the vehicle from the vehicle. Therefore, regardless of the specific position, the traffic signal control apparatus receives position information (for example, latitude, longitude, and road to the construction section) transmitted together with the information, regardless of the position of the vehicle. The position related to the traveling situation can be specified by using the (distance). Therefore, the position where the vehicle information can be acquired becomes more diverse, and accordingly, the traffic jam situation can be grasped more accurately than in the past.

  In addition, the traffic light control device controls the display contents of the traffic lights (2, 3) so that the traffic congestion around the construction section is relieved based on the result of specifying the traffic congestion status. It can actively contribute to alleviating traffic congestion caused by construction.

  In addition, as described in claim 2, the traffic signal control device may acquire travel speed information of the vehicle as travel state information. In this case, the traffic light control device may specify the presence or absence of traffic jam at the position indicated by the acquired position information based on the acquired traveling speed information.

  In this way, the traffic light control device can identify the presence or absence of traffic jams at various positions according to the speed of the vehicle, so how long the traffic jams are based on the presence or absence information. Etc. can also be specified.

  In addition, as described in claim 3, the traffic signal control device may acquire information on the stop time of the vehicle as information on the traveling state. In this way, the traffic light control device can identify traffic jams at various positions according to the stop time of the vehicle.

  Moreover, as described in claim 4, the traffic signal control device may further control the display contents of the traffic signal (2, 3) based on the road environment around the construction section. By doing so, it is possible to perform control more suitable for the surrounding road environment.

  Further, as described in claim 5, the invention described in claim 1 can also be specified as a program.

  In addition, the code | symbol in the bracket | parenthesis in the said and the claim shows the correspondence of the term described in the claim, and the concrete thing etc. which illustrate the said term described in embodiment mentioned later. .

  Hereinafter, an embodiment of the present invention will be described. FIG. 1 schematically shows an application example of the traffic congestion mitigation system according to the present embodiment. In this example, temporary traffic lights 2 and 3 are respectively arranged at both ends of the construction section 1. These traffic lights 2 and 3 are for smoothly carrying out one-side alternate traveling in the construction section 1.

  In the scene of FIG. 1, the vehicles 5 a to 5 c pass the construction section 1 from the lane 5 according to the traffic permission display of the traffic light 3, and the vehicles 6 a and 6 b are in front of the construction section 1 according to the traffic prohibition display of the traffic light 2. Stop in lane 6 At this time, the traffic jam distance in the direction of going straight and entering the construction section 1 from the traffic light 2 is L1. When the vehicle 6c stops at the tail of the vehicle 6b, this traffic jam distance extends to L2. Further, the vehicles 7a to 7c are also stopped in the lane 7 that turns left and enters the lane 6 to reach the construction section 1 from the traffic light 2. At this time, the traffic jam distance in the direction of the left turn approach from the traffic light 2 to the construction section 1 is L1 + L3.

  A traffic signal control device 4 is arranged as a device for controlling the traffic signals 2 and 3. This traffic signal controller 4 wirelessly communicates with one, some or all of the vehicles 5a-c, 6a-c, 7a-c around the construction section 1 such as the lanes 5, 6, 7 and the like, The information on the vehicle is received by the wireless communication, the traffic condition of the road around the construction section 1 is specified based on the received information, and the traffic signal 2 is reduced so as to reduce the traffic congestion based on the specified traffic condition. 3 is controlled.

  Hereinafter, the configuration and operation of such a traffic congestion mitigation system will be described. The traffic congestion mitigation system includes a traffic light 2, a traffic light 3, a traffic signal control device 4, and an in-vehicle communication system mounted on each vehicle that communicates with the traffic signal control device 4.

  FIG. 2 shows a configuration of an in-vehicle communication system mounted on each vehicle. As shown in this figure, the in-vehicle communication system includes a communication device 11, a navigation device 12, and a construction section monitoring device 13. These in-vehicle devices 11 to 13 can exchange signals with each other via the in-vehicle LAN 14.

  The communication device 11 receives the radio signal received from the traffic signal control device 4 and transmits data included in the received signal to the construction section monitoring device 13. Further, the communication device 11 transmits a radio signal to the traffic light control device 4 according to the control from the construction section monitoring device 13.

  The navigation device 12 includes a GPS receiver, a vehicle speed sensor, an acceleration sensor, a yaw rate sensor, and the like. Based on information from these, the current position (latitude, longitude) of the host vehicle, the traveling speed of the host vehicle, the traveling direction, and the like are determined. Identify.

  The navigation device 12 includes map data. The map data includes road data and facility data. Road data includes link ID, link position information, type information (for example, whether the road is a priority road (main road, etc.), whether it is a school road), the node ID, the node It includes position information, type information, speed limit information, and information on the connection relationship between nodes and links. The facility data has multiple records for each facility (department store, park, bridge pier, railroad crossing, traffic light), and each record has name information, location information, land lot number information, facility type information, etc. of the target facility. It has data indicating. Moreover, the map data has position information on accident-prone points.

  When the navigation device 12 receives the designation of the destination from the user, the navigation device 12 calculates an optimum guide route from the current position of the host vehicle to the destination based on the map data, and travels along the calculated guide route. Assistance is provided by right and left turn guidance voices and map images.

  When the navigation device 12 receives a request for information from the construction section monitoring device 13, the navigation device 12 transmits the requested information to the construction section monitoring device 13.

  The construction section monitoring device 13 is composed of a microcomputer having a CPU, RAM, ROM, I / O, and the like. The CPU executes a program read from the ROM, and reads information from the RAM and ROM during the execution. Information is written to the RAM, and signals are exchanged with the communication device 11 and the navigation device 12. The contents of the operation of the traffic signal control device 4 will be described later.

  The traffic signal control device 4 includes a communication unit 41, a storage medium 42, and a control unit 43. The communication unit 41 is a device for performing wireless communication with surrounding vehicles 5a to 5c, 6a to 6c, and 7a to 7c.

  The storage medium 42 is a writable nonvolatile storage medium, and stores the map data and the like as described above.

  The control unit 43 includes a microcomputer having a CPU, RAM, ROM, I / O, and the like. The CPU executes a program read from the ROM, and information is read from the RAM, ROM, and storage medium 42 during the execution. Reading, writing information to the RAM, and the storage medium 42, exchanging signals with the communication unit 41 and the control unit 43, and controlling display contents of the traffic lights 2 and 3.

  Hereinafter, the operation of the traffic congestion mitigation system having such a configuration will be described. The control unit 43 of the traffic light control device 4 controls the communication unit 41 to transmit the position information of the construction section 1 periodically (for example, at intervals of 1 second) to surrounding vehicles. The position information to be transmitted may be, for example, information including the ID of a link in which the construction section 1 exists and information on the range of the construction section 1 in the link. The position information of the construction section 1 used for transmission is input by an operator of the traffic light control device 4 using an input device (not shown), and the control unit 43 records the input information in the storage medium 42. It may be.

  Further, the construction section monitoring device 13 of each vehicle repeatedly executes the program 100 as shown in the flowchart in FIG. In the execution of the program 100, first, in step 110, the vehicle waits until it enters the vicinity of the construction section 1. If it is determined that the vehicle has entered, then in step 120, transmission data is created, and in step 130, the communication device 11 is used. Vehicle data.

  Here, whether or not the own vehicle has entered the vicinity of the construction section 1 is determined by whether or not the distance from the current position of the own vehicle to the construction section 1 is within a reference distance (for example, 500 meters). The construction section monitoring device 13 receives the position information of the construction section 1 transmitted from the traffic light control device 4 via the communication device 11, and specifies the position of the construction section 1 based on the received information. The construction section monitoring device 13 acquires the current position of the host vehicle by requesting the navigation device 12.

  The vehicle data created in step 120 includes the vehicle identification ID, the current time, the current traveling speed of the host vehicle (corresponding to an example of travel status information), and the current approach direction of the host vehicle to the construction section 1 ( (Corresponding to an example of travel status information), a distance along the road to the current construction section 1 of the own vehicle (corresponding to an example of position information), and a current position of the own vehicle (corresponding to an example of position information) )including. When the host vehicle is stopped, the duration of the stop (corresponding to an example of travel state information) is also included in the vehicle data.

  Here, the approaching direction to the construction section 1 is a direction that goes straight and reaches the construction section 1, a direction that turns left and reaches the construction section 1, or a direction that turns right and reaches the construction section 1 Say. For example, the approaching direction to the construction section 1 of the vehicles 5a to 5c in FIG. 1 is a straight traveling direction to the traffic light 3 side, and the approaching direction to the construction section 1 of the vehicles 6a to c is a straight traveling direction to the traffic light 2 side. The approaching direction of the vehicles 7a to 7c to the construction section 1 is the left turn direction to the traffic light 2 side.

  The vehicle identification ID may be recorded in advance in the ROM of the construction section monitoring device 13. Further, information on the traveling speed of the own vehicle, the approach direction of the own vehicle to the construction section 1, the distance along the road to the construction section 1 of the own vehicle, and the position (latitude and longitude) of the own vehicle are transmitted to the navigation device 12. Get by request.

  In addition, when the navigation apparatus 12 is requested for information on the distance along the road to the construction section 1, the navigation device 12 determines the shortest distance from the own vehicle to the construction section 1 based on the map data, the current position of the own vehicle, and the traveling direction. The route is specified, and further, the distance from the own vehicle along the specified route to the construction section 1 is specified, and the specified distance is used as information on the distance along the road to the construction section 1. Send to.

  Further, when the navigation device 12 is requested for information on the approach direction to the construction section 1, the navigation device 12 specifies the shortest route from the own vehicle to the construction section 1 based on the map data, the current position of the own vehicle, and the traveling direction. If you follow that route, specify whether your vehicle will go straight ahead, turn left, or turn right before you reach the front of construction section 1, and use the identification results as approach direction information to monitor the construction section. Transmit to device 13.

  The construction section monitoring device 13 may not create and transmit vehicle data when the traveling direction of the host vehicle is away from the construction section 1.

  As described above, the vehicle identification ID, the current time, the traveling speed, the approach direction, and the construction section 1 from one or more vehicles approaching the construction section 1 around the construction section 1 to the traffic signal control device 4 Information such as the distance and stop duration is transmitted sequentially.

  Next, the operation of the control unit 43 of the traffic signal control device 4 that receives vehicle data from such a vehicle will be described. The control unit 43 repeatedly executes the program 200 as shown in FIG. 5, and in each execution, first, in step 210, the vehicle data transmitted from the vehicle as described above is received and recorded in the storage medium 42.

  Subsequently, in step 220, based on the vehicle data received this time and recorded in the storage medium 42 and the vehicle data received in the past and recorded in the storage medium 42, the congestion distance of the traffic jam caused by the construction section 1 is calculated. Subsequently, in step 230, the display contents of the traffic lights 2 and 3 are controlled based on the calculated traffic jam distance and the like.

  More specifically, in step 220, information such as a traffic jam distance, a traffic jam direction, a change in the traffic jam degree, and a time required for the vehicle to pass through the construction section 1 (each corresponds to an example of a traffic jam situation). )).

  First, a method for calculating a traffic jam distance and a traffic jam direction will be described. The control unit 43 specifies the presence or absence of traffic jams (corresponding to an example of a traffic jam situation) at a plurality of locations on the road around the construction section 1. Specifically, vehicle data having time information within a predetermined time (for example, 1 minute) is extracted from the vehicle data recorded in the storage medium 42 based on each of the extracted vehicle data. Thus, the presence or absence of traffic jam at the position corresponding to the current position in the vehicle data is specified.

  Whether or not the current position in certain vehicle data is congested is determined by reading the speed limit of the road to which the position belongs from the map data, comparing the speed limit with the travel speed in the vehicle data, Is lower than the speed limit by a reference speed difference (for example, 1/2 of the speed limit), it is determined that the position is congested.

  As a result of determining whether or not there is a traffic jam, the traffic distance from the construction zone 1 is calculated assuming that all the routes from the position where the traffic jam is determined to the construction zone 1 are jammed. For example, in the example of FIG. 1, when only the traveling speed included in the vehicle information from the vehicle 7 c and the vehicle 7 a is lower than the reference speed by the reference speed or more than the speed limit of the position, the traffic light 2 in the construction section 1 from the vehicle 7 c. The distance to the side edge is considered to be congested, and the congested distance is L1 + L3. Then, the direction of the traffic jam is identified as the left turn direction to the traffic signal 2 by identifying the road to which the position determined to have the traffic jam belongs.

  By doing in this way, it is possible to grasp how fast each road for approaching the construction section 1 is flowing, and by comparing it with the speed limit, traffic congestion starts. Can be determined. Further, by receiving vehicle data from a plurality of vehicles and using it for calculating the traffic jam situation, the reliability of the traffic jam situation to be calculated is improved.

  Instead of the speed limit, a constant speed (for example, 40 km / h) may be used regardless of the road. Further, as the traffic jam distance from the position where there is a traffic jam to the construction section 1, information on the distance to the construction section 1 included in the vehicle data together with the position may be used. It may be calculated based on the above.

  Next, a method for calculating a change in the degree of congestion will be described. The control unit 43 groups the vehicle data in the storage medium 42 according to the approach direction to the construction section 1. If the stop duration in the vehicle data tends to decrease in each group, the traffic congestion in the approach direction is reduced. If it is determined that it is being eased, and it is in an increasing trend, it is determined that the degree of congestion in the proximity direction is increasing.

  Next, the calculation direction of the time required for the vehicle to pass through the construction section 1 will be described. The control unit 43 extracts the vehicle data having the same vehicle identification ID from the storage medium 42, and the vehicle corresponding to the vehicle identification ID is determined to be the construction section 1 based on the time information and the position information in the extracted vehicle data. Identify the actual time it took to pass through. Such an actual passing time is specified for a plurality of vehicles, and a statistical representative value or the latest value such as an average value of the specifying results is specified as a time required for the vehicle to pass through the construction section 1. .

  Next, details of the control of the traffic lights 2 and 3 in step 230 will be described. For example, when the information on the traffic distance and the traffic direction calculated in step 220 is used, the traffic distance on the side entering from the traffic light 2 is compared with the traffic distance on the side entering from the traffic light 3, It is also possible to lengthen the time for the traffic light with the longer distance to perform the passage permission display and shorten the time for the traffic light with the shorter traffic distance to perform the passage permission display. At that time, as illustrated in FIG. 2, when there are a plurality of directions (specifically, a straight-ahead direction and a left-turn direction) as directions close to the construction section 1 from the traffic light 2, the traffic jam distance on the traffic light 2 side is You may use the sum total of the congestion distance about a near direction (however, it overlaps and does not add about the overlapping part of a congestion).

  In this way, as shown in FIG. 6, in a situation where there is no vehicle on the road 9 on the traffic light 3 side, the traffic permission display time of the traffic light 2 increases, so the road 8 on the traffic light 2 side. The possibility that the vehicles 8a and 8b of the vehicle will wait for meaninglessly is reduced.

  Further, for example, when using information on the change in the calculated traffic congestion degree, the increase amount of the traffic congestion degree on the side entering from the traffic light 2 (that is, the increase amount of the stop duration) and the side entering from the traffic light 3 Compared with the increase amount of the traffic jam distance, it is possible to lengthen the time for the traffic signal having the larger increase amount to perform the passage permission display and shorten the time for the traffic light having the smaller increase amount to perform the passage permission display. At that time, as illustrated in FIG. 2, when there are a plurality of directions from the traffic light 2 to the construction section 1, the traffic jam distance on the traffic light 2 side may be the sum of the increase amounts in the proximity directions. Good.

  Note that the display contents of the traffic lights 2 and 3 (for example, the length of time during which traffic is permitted to be displayed) are controlled by combining information on the traffic jam distance, the traffic jam direction, and the change in the traffic jam degree. Also good.

  Further, for example, in addition to the above control, the display contents of the traffic lights 2 and 3 may be adjusted based on the road environment around the construction section 1. The road environment to be used includes, for example, whether or not it is a priority road, the presence of traffic lights other than traffic lights 2 and 3, the presence of bridge piers, the presence of railroad crossings, whether or not it is a school road, the location where accidents occur frequently The existence of These pieces of information are read from the map data in the storage medium 42.

  For example, when the priority road is included in the direction approaching the construction section 1 from the traffic light 2 side, the time for the traffic permission display of the traffic light 2 may be increased as compared to the case where the priority road is not included. This is because the traffic volume on the priority road is expected to be larger than the traffic volume on roads other than the priority road.

  Also, for example, when there is a traffic signal other than a bridge pier, railroad crossing, traffic lights 2 and 3 in the vicinity of the construction section 1 (for example, within 500 meters from the construction section 1) on a road close to the construction section 1 from the traffic light 2 side Compared with the case where it is not so, you may lengthen the time of the traffic permission display of the traffic light 2. The reason for this is that traffic lights, piers, and railroad crossings are in the vicinity of the construction section 1, so that it is highly possible to enter a specific side of the construction section 1 from a plurality of directions, and there is a high possibility that traffic congestion will extend on that side. Because.

  In addition, for example, when there is a traffic light other than the pier, railroad crossing, traffic lights 2 and 3 in the vicinity of the construction section 1 (for example, within 500 meters from the construction section 1), the traffic permission indication of the traffic light 2 is displayed as compared to the case where it is not. The time may be lengthened. The reason for this is that traffic lights, piers, and railroad crossings are in the vicinity of the construction section 1 is likely to be able to enter a specific side of the construction section 1 from a plurality of directions, and there is a possibility that traffic congestion will extend on that side. Because it is expensive.

  In addition, for example, if there is a school road or accident-prone area near the construction section 1 (for example, within 500 meters from the construction section 1), traffic signals 2 and 3 are not allowed to enter the construction section 1. The permission display time may be shortened.

  It should be noted that among the traffic jam conditions identified in step 220, those that are not used for the control of the traffic lights 2 and 3 can be recorded in the storage medium 42 to be useful for later analyzing the traffic jam caused by the construction. .

  As described above, the traffic light control device 4 obtains the position information and travel status information of the vehicle from the vehicles around the construction section 1 by wireless communication (see step 210), and based on the travel status information. Then, the traffic situation at the position indicated by the position information is specified (see step 220), and the display contents of the traffic lights 2 and 3 are controlled based on the specification result so that the traffic around the construction section 1 is alleviated. (See step 230).

  Thus, the traffic signal control device 4 can acquire the information on the driving situation at the position by receiving both the position information and the driving situation information of the vehicle from the vehicle. Therefore, even if the traffic signal control device 4 receives the travel status information from any position of the vehicle regardless of the specific position, the traffic signal control device 4 transmits the position information (for example, the latitude, longitude, road to the construction section). The distance according to the travel situation can be specified by using the (distance along). Therefore, the position where the vehicle information can be acquired becomes more diverse, and accordingly, the traffic jam situation can be grasped more accurately than in the past.

  The traffic light control device 4 controls the display contents of the traffic lights 2 and 3 so that the traffic congestion around the construction section is alleviated based on the result of identifying the traffic congestion status. Can actively contribute to alleviation of traffic jams.

  In addition, the traffic signal control device 4 acquires the traveling speed information of the vehicle as the traveling state information, specifies the presence or absence of traffic jam at the position indicated by the acquired positional information based on the acquired traveling speed information, and based on the information Thus, the traffic jam distance due to construction section 1 is calculated.

  In this way, the traffic signal control device 4 can identify the presence or absence of traffic jams at various positions according to the speed of the vehicle, so how long the traffic jams are based on the information on the presence or absence of traffic jams. It is also possible to specify whether or not.

  Moreover, the traffic signal control device 4 acquires information on the stop duration of the vehicle as the travel state information, and controls the display contents of the traffic lights 2 and 3 based on the information. In this way, the traffic signal control device 4 can identify the traffic jam situation at various positions according to the stop time of the vehicle.

  Further, the traffic light control device 4 further controls the display contents of the traffic lights 2 and 3 based on the road environment around the construction section 1. By doing so, it is possible to perform control more suitable for the surrounding road environment.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, the scope of the present invention is not limited only to the said embodiment, The various form which can implement | achieve the function of each invention specific matter of this invention is included. It is.

  For example, in the above embodiment, the construction section monitoring device 13 specifies the position of the traffic signal control device 4 based on the position information transmitted from the traffic signal control device 4, but the construction section monitoring device 13 is the VICS. The position information of the wireless communication device other than the traffic signal control device 4, that is, the traffic signal control device 4 may be received using a wireless communication means such as the above.

  The navigation device 12 may also have the function of the construction section monitoring device 13.

  Further, the traffic signal control device 4 specifies the current distance along the road to the construction section 1 of the vehicle based on the position of the vehicle received from the vehicle and the map data in the storage medium 42. It may be. In that case, the construction section monitoring device 13 of the vehicle does not need to transmit information on the distance along the road to the construction section 1 of the current vehicle to the traffic signal control device 4.

  In the above embodiment, each function realized by the program executed by the control circuit 43 is realized by using hardware having those functions (for example, an FPGA capable of programming a circuit configuration). You may come to do.

It is a schematic diagram which shows the example of application of the traffic congestion mitigation system which concerns on embodiment of this invention. It is a block diagram which shows the structure in a vehicle. 3 is a block diagram showing a configuration of a traffic signal control device 4. FIG. It is a flowchart which shows the process which the construction area monitoring apparatus 13 performs. It is a flowchart which shows the process which the control part 43 of the traffic signal control apparatus 4 performs. It is a schematic diagram which shows the application example of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Construction area 2, 3 Traffic light 4 Traffic light control apparatus 5-9 Lane 5a-c Vehicle 6a-c Vehicle 7a-c Vehicle 8a-b Vehicle 11 Communication apparatus 12 Navigation apparatus 13 Construction area monitoring apparatus

Claims (5)

A traffic signal control device for controlling traffic signals (2, 3) provided on both sides of a construction section,
Vehicle information acquisition means (210) for acquiring the position information of the vehicle and the information of the traveling state from the vehicles around the construction section by wireless communication;
A specifying unit (220) for identifying a traffic jam situation at a position indicated by the position information acquired by the vehicle information acquisition unit (210) based on the information on the travel situation acquired by the vehicle information acquisition unit (210);
A traffic signal comprising control means (230) for controlling the display contents of the traffic light (2, 3) so that traffic congestion around the construction section is alleviated based on the result of the specification of the specification means (220) Control device. The vehicle information acquisition means (210) acquires travel speed information of the vehicle as the travel status information,
The specifying means (220) specifies the presence or absence of traffic jam at the position indicated by the position information acquired by the vehicle information acquiring means (210) based on the travel speed information acquired by the vehicle information acquiring means (210). The traffic light control apparatus according to claim 1.   The traffic light control device according to claim 1, wherein the vehicle information acquisition unit (210) acquires information on a stop time of the vehicle as information on the traveling state.   The control means (230) further controls display contents of the traffic light (2, 3) based on a road environment around the construction section. The traffic signal control device described. A program used for a traffic signal control device for controlling traffic signals (2, 3) provided on both sides of a construction section,
Vehicle information acquisition means (210) for acquiring, by wireless communication, position information and travel status information of the vehicle from vehicles around the construction section;
A specifying means (220) for specifying the presence or absence of traffic jam at the position indicated by the position information acquired by the vehicle information acquiring means (210) based on the information on the traveling situation acquired by the vehicle information acquiring means (210); A program that causes a computer to function as control means (230) that controls display contents of the traffic light (2, 3) so that traffic congestion around the construction section is alleviated based on the identification result of the identification means (220) .

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